Help taking snapshots from terminal

[aespielberg]

Hi,

I'm just getting my feet wet with using VLC from the terminal, and I want to use it to image capture from a device. I have the following written:

cvlc -V snapshot --snapshot-format png --snapshot-width=1600 --snapshot-height=1200 --snapshot-prefix=pic --snapshot-sequential v4l2:///dev/video0 vlc://quit

If I remove the snapshot command, but add a snapshot-key option and press that key, this works exactly as I want it to. With the above, however, I get the following output (verbose version, though I've bolded the error, by the bottom):

VLC media player 1.1.4 The Luggage (revision exported)
[0x826d914] main libvlc debug: VLC media player - 1.1.4 The Luggage
[0x826d914] main libvlc debug: Copyright © 1996-2010 the VideoLAN team
[0x826d914] main libvlc debug: revision exported
[0x826d914] main libvlc debug: configured with ./configure '--enable-static' '--build=i686-linux-gnu' '--config-cache' '--disable-maintainer-mode' '--disable-silent-rules' '--disable-update-check' '--enable-fast-install' '--prefix=/usr' '--sysconfdir=/etc' '--with-binary-version=1ubuntu1.4' '--enable-a52' '--enable-aa' '--enable-bonjour' '--enable-caca' '--enable-dca' '--enable-dirac' '--enable-dvb' '--enable-dvbpsi' '--enable-dvdnav' '--enable-faad' '--enable-flac' '--enable-fluidsynth' '--enable-freetype' '--enable-fribidi' '--enable-ggi' '--enable-gnutls' '--enable-jack' '--enable-kate' '--enable-libass' '--enable-libmpeg2' '--enable-libproxy' '--enable-libxml2' '--enable-lirc' '--enable-live555' '--enable-mad' '--enable-mkv' '--enable-mod' '--enable-mozilla' '--enable-mpc' '--enable-mtp' '--enable-mux_ogg' '--enable-ncurses' '--enable-notify' '--enable-ogg' '--enable-pulse' '--enable-qt4' '--enable-realrtsp' '--enable-schroedinger' '--enable-sdl' '--enable-shout' '--enable-skins2' '--enable-smb' '--enable-speex' '--enable-svg' '--enable-taglib' '--enable-theora' '--enable-twolame' '--enable-upnp' '--enable-vcd' '--enable-vcdx' '--enable-vorbis' '--enable-x264' '--enable-zvbi' '--with-kde-solid=/usr/share/kde4/apps/' '--with-mozilla-pkg=libxul' '--disable-dxva2' '--disable-gnomevfs' '--disable-goom' '--disable-osso_screensaver' '--disable-portaudio' '--disable-projectm' '--disable-sqlite' '--disable-telx' '--enable-alsa' '--enable-atmo' '--enable-dc1394' '--enable-dv' '--enable-libva' '--enable-pvr' '--enable-udev' '--enable-v4l' '--enable-v4l2' '--enable-svgalib' 'build_alias=i686-linux-gnu' 'CFLAGS=-g -O2' 'LDFLAGS=-Wl,--as-needed' 'CPPFLAGS=' 'CXXFLAGS=-g -O2'
[0x826d914] main libvlc debug: translation test: code is "C"
[0x826d914] main libvlc debug: checking plugin modules
[0x826d914] main libvlc debug: loading plugins cache file /usr/lib/vlc/plugins/plugins-04041e-3e8.dat
[0x826d914] main libvlc debug: recursively browsing `/usr/lib/vlc/plugins'
[0x826d914] main libvlc debug: saving plugins cache /usr/lib/vlc/plugins/plugins-04041e-3e8.dat
[0x826d914] main libvlc debug: module bank initialized (394 modules)
[0x826d914] main libvlc debug: opening config file (/home/andrewspielberg/.config/vlc/vlcrc)
[0x826d914] main libvlc debug: CPU has capabilities MMX MMXEXT SSE SSE2 SSE3 SSSE3 FPU
[0x826d914] main libvlc debug: looking for memcpy module: 3 candidates
[0x826d914] main libvlc debug: using memcpy module "memcpymmxext"
[0x830518c] main input debug: Creating an input for 'Media Library'
[0x830518c] main input debug: Input is a meta file: disabling unneeded options
[0x830518c] main input debug: using timeshift granularity of 50 MiB
[0x830518c] main input debug: using timeshift path '/tmp'
[0x830518c] main input debug: `file/xspf-open:///home/andrewspielberg/.local/share/vlc/ml.xspf' gives access `file' demux `xspf-open' path `/home/andrewspielberg/.local/share/vlc/ml.xspf'
[0x830518c] main input debug: creating demux: access='file' demux='xspf-open' path='/home/andrewspielberg/.local/share/vlc/ml.xspf'
[0x830d974] main demux debug: looking for access_demux module: 2 candidates
[0x830d974] main demux debug: no access_demux module matching "file" could be loaded
[0x830d974] main demux debug: TIMER module_need() : 0.836 ms - Total 0.836 ms / 1 intvls (Avg 0.836 ms)
[0x830518c] main input debug: creating access 'file' path='/home/andrewspielberg/.local/share/vlc/ml.xspf'
[0x82ff784] main access debug: looking for access module: 2 candidates
[0x82ff784] filesystem access debug: opening file `/home/andrewspielberg/.local/share/vlc/ml.xspf'
[0x82ff784] main access debug: using access module "filesystem"
[0x82ff784] main access debug: TIMER module_need() : 0.442 ms - Total 0.442 ms / 1 intvls (Avg 0.442 ms)
[0x830e704] main stream debug: Using AStream*Stream
[0x830e704] main stream debug: pre buffering
[0x830e704] main stream debug: received first data after 0 ms
[0x830e704] main stream debug: pre-buffering done 296 bytes in 0s - 13139 KiB/s
[0x830eba4] main stream debug: looking for stream_filter module: 5 candidates
[0x830eba4] main stream debug: no stream_filter module matching "any" could be loaded
[0x830eba4] main stream debug: TIMER module_need() : 0.619 ms - Total 0.619 ms / 1 intvls (Avg 0.619 ms)
[0x830eba4] main stream debug: looking for stream_filter module: 1 candidate
[0x830eba4] main stream debug: using stream_filter module "stream_filter_record"
[0x830eba4] main stream debug: TIMER module_need() : 0.283 ms - Total 0.283 ms / 1 intvls (Avg 0.283 ms)
[0x830518c] main input debug: creating demux: access='file' demux='xspf-open' path='/home/andrewspielberg/.local/share/vlc/ml.xspf'
[0x83017b4] main demux debug: looking for demux module: 1 candidate
[0x83017b4] playlist demux debug: using XSPF playlist reader
[0x83017b4] main demux debug: using demux module "playlist"
[0x83017b4] main demux debug: TIMER module_need() : 0.386 ms - Total 0.386 ms / 1 intvls (Avg 0.386 ms)
[0x83027fc] main demux meta debug: looking for meta reader module: 2 candidates
[0x83027fc] lua demux meta debug: Trying Lua scripts in /home/andrewspielberg/.local/share/vlc/lua/meta/reader
[0x83027fc] lua demux meta debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/reader
[0x83027fc] lua demux meta debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/reader/filename.luac
[0x83027fc] lua demux meta debug: Trying Lua scripts in /usr/share/vlc/lua/meta/reader
[0x83027fc] main demux meta debug: no meta reader module matching "any" could be loaded
[0x83027fc] main demux meta debug: TIMER module_need() : 3.497 ms - Total 3.497 ms / 1 intvls (Avg 3.497 ms)
[0x830518c] main input debug: `file/xspf-open:///home/andrewspielberg/.local/share/vlc/ml.xspf' successfully opened
[0x83027fc] main xml debug: looking for xml module: 2 candidates
[0x83027fc] main xml debug: using xml module "xml"
[0x83027fc] main xml debug: TIMER module_need() : 0.628 ms - Total 0.628 ms / 1 intvls (Avg 0.628 ms)
[0x83017b4] playlist demux debug: parsed 0 tracks successfully
[0x83027fc] main xml debug: removing module "xml"
[0x830518c] main input debug: EOF reached
[0x83017b4] main demux debug: removing module "playlist"
[0x830eba4] main stream debug: removing module "stream_filter_record"
[0x82ff784] main access debug: removing module "filesystem"
[0x830518c] main input debug: TIMER input launching for 'Media Library' : 6.703 ms - Total 6.703 ms / 1 intvls (Avg 6.703 ms)
[0x830572c] main interface debug: looking for interface module: 1 candidate
[0x830572c] main interface debug: using interface module "hotkeys"
[0x830572c] main interface debug: TIMER module_need() : 0.336 ms - Total 0.336 ms / 1 intvls (Avg 0.336 ms)
[0x83027fc] main interface debug: looking for interface module: 1 candidate
Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
[0x827be64] main playlist debug: Activated
[0x83027fc] main interface debug: using interface module "inhibit"
[0x83027fc] main interface debug: TIMER module_need() : 2.959 ms - Total 2.959 ms / 1 intvls (Avg 2.959 ms)
[0x827be64] main playlist debug: adding item `quit' ( vlc://quit )
[0x827be64] main playlist debug: adding item `v4l2:///dev/video0' ( v4l2:///dev/video0 )
[0x8318464] main interface debug: looking for interface module: 1 candidate
[0x8318464] main interface debug: using interface module "signals"
[0x8318464] main interface debug: TIMER module_need() : 0.369 ms - Total 0.369 ms / 1 intvls (Avg 0.369 ms)
[0x831ea64] main interface debug: looking for interface module: 1 candidate
[0x827be64] main playlist debug: rebuilding array of current - root Playlist
[0x827be64] main playlist debug: rebuild done - 2 items, index -1
[0x831acac] main input debug: Creating an input for 'quit'
[0x827be64] main playlist debug: meta ok for (null), need to fetch art
[0x831d13c] main demux meta debug: looking for meta fetcher module: 1 candidate
[0x831d13c] lua demux meta debug: Trying Lua scripts in /home/andrewspielberg/.local/share/vlc/lua/meta/fetcher
[0x831d13c] lua demux meta debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/fetcher
[0x831d13c] lua demux meta debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/fetcher/tvrage.luac
[0x831d13c] main demux meta debug: using meta fetcher module "lua"
[0x831d13c] main demux meta debug: TIMER module_need() : 0.776 ms - Total 0.776 ms / 1 intvls (Avg 0.776 ms)
[0x831d13c] main demux meta debug: removing module "lua"
[0x827be64] main playlist debug: searching art for quit
[0x831d13c] main art finder debug: looking for art finder module: 2 candidates
[0x831d13c] lua art finder debug: Trying Lua scripts in /home/andrewspielberg/.local/share/vlc/lua/meta/art
[0x831d13c] lua art finder debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/art
[0x831d13c] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/01_googleimage.luac
[0x831d13c] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/02_frenchtv.luac
[0x831d13c] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/03_lastfm.luac
[0x831d13c] lua art finder debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/art/04_musicbrainz.luac
[0x831d13c] lua art finder debug: Trying Lua scripts in /usr/share/vlc/lua/meta/art
[0x831d13c] main art finder debug: no art finder module matching "any" could be loaded
[0x831d13c] main art finder debug: TIMER module_need() : 2.243 ms - Total 2.243 ms / 1 intvls (Avg 2.243 ms)
[0x827be64] main playlist debug: art not found for quit
[0x831ea64] main interface debug: using interface module "globalhotkeys"
[0x831ea64] main interface debug: TIMER module_need() : 16.309 ms - Total 16.309 ms / 1 intvls (Avg 16.309 ms)
[0x831b4e4] main interface debug: looking for interface module: 1 candidate
[0x831b4e4] dummy interface: using the dummy interface module...
[0x831b4e4] main interface debug: using interface module "dummy"
[0x831b4e4] main interface debug: TIMER module_need() : 0.390 ms - Total 0.390 ms / 1 intvls (Avg 0.390 ms)
[0x827be64] main playlist debug: processing request item null node Playlist skip 0
[0x827be64] main playlist debug: starting new item
[0x827be64] main playlist debug: creating new input thread
[0x831b0b4] main input debug: Creating an input for 'v4l2:///dev/video0'
[0x831b0b4] main input debug: thread (input) created at priority 10 (input/input.c:214)
[0x831b0b4] main input debug: thread started
[0x831b0b4] main input debug: using timeshift granularity of 50 MiB
[0x831b0b4] main input debug: using timeshift path '/tmp'
[0x831b0b4] main input debug: `v4l2:///dev/video0' gives access `v4l2' demux `' path `/dev/video0'
[0x831b0b4] main input debug: creating demux: access='v4l2' demux='' path='/dev/video0'
[0x831ff6c] main demux debug: looking for access_demux module: 1 candidate
[0x831ff6c] v4l2 demux debug: Trying direct kernel v4l2
[0x831ff6c] v4l2 demux debug: opening device '/dev/video0'
[0x831ff6c] v4l2 demux debug: V4L2 device: Venus USB2.0 Camera using driver: uvcvideo (version: 0.1.0) on usb-0000:00:1d.7-2
[0x831ff6c] v4l2 demux debug: the device has the capabilities: (X) Video Capture, ( ) Audio, ( ) Tuner, ( ) Radio
[0x831ff6c] v4l2 demux debug: supported I/O methods are: ( ) Read/Write, (X) Streaming, ( ) Asynchronous
[0x831ff6c] v4l2 demux debug: video input 0 (Camera 1) has type: External analog input *
[0x831ff6c] v4l2 demux debug: device supports chroma YUY2 [YUV 4:2:2 (YUYV), YUYV]
[0x831ff6c] v4l2 demux debug: device supports size 640x480
[0x831ff6c] v4l2 demux debug: device supports size 352x288
[0x831ff6c] v4l2 demux debug: device supports size 320x240
[0x831ff6c] v4l2 demux debug: device supports size 176x144
[0x831ff6c] v4l2 demux debug: device supports size 160x120
[0x831ff6c] v4l2 demux debug: device supports size 800x600
[0x831ff6c] v4l2 demux debug: device supports size 1280x960
[0x831ff6c] v4l2 demux debug: device supports size 1280x1024
[0x831ff6c] v4l2 demux debug: device supports size 1600x1200
[0x831ff6c] v4l2 demux debug: '/dev/video0' is a video device
[0x831ff6c] v4l2 demux debug: Extended control API supported by v4l2 driver
[0x831ff6c] v4l2 demux debug: Available control: Brightness (980900)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: -10 to 10 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 0
[0x831ff6c] v4l2 demux debug: current value: 0
[0x831ff6c] v4l2 demux debug: Available control: Contrast (980901)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 0 to 20 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 10
[0x831ff6c] v4l2 demux debug: current value: 10
[0x831ff6c] v4l2 demux debug: Available control: Saturation (980902)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 0 to 10 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 4
[0x831ff6c] v4l2 demux debug: current value: 4
[0x831ff6c] v4l2 demux debug: Available control: White Balance Temperature, Auto (98090c)
[0x831ff6c] v4l2 demux debug: boolean control
[0x831ff6c] v4l2 demux debug: default value: 1
[0x831ff6c] v4l2 demux debug: current value: 1
[0x831ff6c] v4l2 demux debug: Available control: Gamma (980910)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 100 to 200 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 150
[0x831ff6c] v4l2 demux debug: current value: 150
[0x831ff6c] v4l2 demux debug: Available control: Gain (980913)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 32 to 48 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 34
[0x831ff6c] v4l2 demux debug: current value: 34
[0x831ff6c] v4l2 demux debug: Available control: Power Line Frequency (980918)
[0x831ff6c] v4l2 demux debug: menu control
[0x831ff6c] v4l2 demux debug: 0: Disabled
[0x831ff6c] v4l2 demux debug: 1: 50 Hz
[0x831ff6c] v4l2 demux debug: 2: 60 Hz
[0x831ff6c] v4l2 demux debug: default value: 1
[0x831ff6c] v4l2 demux debug: current value: 1
[0x831ff6c] v4l2 demux debug: Available control: White Balance Temperature (98091a)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 2800 to 6500 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 6500
[0x831ff6c] v4l2 demux debug: current value: 6500
[0x831ff6c] v4l2 demux debug: Available control: Sharpness (98091b)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 0 to 10 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 5
[0x831ff6c] v4l2 demux debug: current value: 5
[0x831ff6c] v4l2 demux debug: Available control: Backlight Compensation (98091c)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 0 to 2 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 0
[0x831ff6c] v4l2 demux debug: current value: 0
[0x831ff6c] v4l2 demux debug: Available private control: Exposure, Auto (9a0901)
[0x831ff6c] v4l2 demux debug: menu control
[0x831ff6c] v4l2 demux debug: 0: Auto Mode
[0x831ff6c] v4l2 demux debug: 1: Manual Mode
[0x831ff6c] v4l2 demux debug: 2: Shutter Priority Mode
[0x831ff6c] v4l2 demux debug: 3: Aperture Priority Mode
[0x831ff6c] v4l2 demux debug: default value: 3
[0x831ff6c] v4l2 demux debug: current value: 3
[0x831ff6c] v4l2 demux debug: Available private control: Exposure (Absolute) (9a0902)
[0x831ff6c] v4l2 demux debug: integer control
[0x831ff6c] v4l2 demux debug: valid values: 8 to 16384 by steps of 1
[0x831ff6c] v4l2 demux debug: default value: 512
[0x831ff6c] v4l2 demux debug: current value: 512
[0x831ff6c] v4l2 demux debug: using streaming i/o (mmap)
[0x831ff6c] v4l2 demux debug: found default width and height of 640x480
[0x831ff6c] v4l2 demux debug: will try to find optimal width and height.
[0x831ff6c] v4l2 demux debug: Found maximum framerate of 30.000000
[0x831ff6c] v4l2 demux debug: Found optimal dimensions for framerate 30.000000 of 640x480
[0x831ff6c] v4l2 demux debug: Driver requires at most 614400 bytes to store a complete image
[0x831ff6c] v4l2 demux debug: Interlacing setting: progressive
[0x831ff6c] v4l2 demux debug: supported frame intervals for YUY2, 640x480:
[0x831ff6c] v4l2 demux debug: supported frame interval: 1/30
[0x831ff6c] v4l2 demux debug: supported frame interval: 1/15
[0x831ff6c] v4l2 demux debug: added new video es YUY2 640x480
[0x831b0b4] main input debug: selecting program id=0
[0x831ff6c] v4l2 demux debug: User set fps=30.000000
[0x831ff6c] main demux debug: using access_demux module "v4l2"
[0x831ff6c] main demux debug: TIMER module_need() : 37.328 ms - Total 37.328 ms / 1 intvls (Avg 37.328 ms)
[0x8320704] main decoder debug: looking for decoder module: 30 candidates
[0x8320704] rawvideo decoder warning: invalid frame rate 0/0, using 25 fps instead
[0x8320704] main decoder debug: using decoder module "rawvideo"
[0x8320704] main decoder debug: TIMER module_need() : 18.522 ms - Total 18.522 ms / 1 intvls (Avg 18.522 ms)
[0x8320704] main decoder debug: thread (decoder) created at priority 0 (input/decoder.c:301)
[0x8320704] main decoder debug: thread started
[0x832527c] main demux meta debug: looking for meta reader module: 2 candidates
[0x832527c] lua demux meta debug: Trying Lua scripts in /home/andrewspielberg/.local/share/vlc/lua/meta/reader
[0x832527c] lua demux meta debug: Trying Lua scripts in /usr/lib/vlc/lua/meta/reader
[0x832527c] lua demux meta debug: Trying Lua playlist script /usr/lib/vlc/lua/meta/reader/filename.luac
[0x832527c] lua demux meta debug: Trying Lua scripts in /usr/share/vlc/lua/meta/reader
[0x832527c] main demux meta debug: no meta reader module matching "any" could be loaded
[0x832527c] main demux meta debug: TIMER module_need() : 0.783 ms - Total 0.783 ms / 1 intvls (Avg 0.783 ms)
[0x831b0b4] main input debug: `v4l2:///dev/video0' successfully opened
[0x831b0b4] main input debug: Buffering 0%
[0x831b0b4] main input debug: no usable vout present, spawning one
[0x8334e24] main spu text debug: looking for text renderer module: 2 candidates
[0x8334e24] freetype spu text debug: Building font databases.
[0x8334e24] freetype spu text debug: Using Serif Bold as font from file /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf
[0x8334e24] freetype spu text debug: using fontsize: 2
[0x8334e24] main spu text debug: using text renderer module "freetype"
[0x8334e24] main spu text debug: TIMER module_need() : 11.492 ms - Total 11.492 ms / 1 intvls (Avg 11.492 ms)
[0x8335784] main scale debug: looking for video filter2 module: 18 candidates
[0x8335784] swscale scale debug: 32x32 chroma: YUVA -> 16x16 chroma: YUVA with scaling using Bicubic (good quality)
[0x8335784] main scale debug: using video filter2 module "swscale"
[0x8335784] main scale debug: TIMER module_need() : 5.104 ms - Total 5.104 ms / 1 intvls (Avg 5.104 ms)
[0x833be04] main scale debug: looking for video filter2 module: 18 candidates
[0x833be04] yuvp scale debug: YUVP to YUVA converter
[0x833be04] main scale debug: using video filter2 module "yuvp"
[0x833be04] main scale debug: TIMER module_need() : 2.490 ms - Total 2.490 ms / 1 intvls (Avg 2.490 ms)
[0x8336c1c] main video output debug: window size: 640x480
[0x8336c1c] main video output debug: Deinterlacing available
[0x8336c1c] main video output debug: deinterlace 0, mode blend, is_needed 0
[0x8336c1c] main video output debug: looking for video output module: 1 candidate
[0x8336c1c] vout_wrapper video output debug: Opening vout display wrapper
[0x83e34b4] main generic debug: looking for vout display module: 0 candidates
[0x83e34b4] main generic debug: no vout display module matched "snapshot"
[0x83e34b4] main generic debug: TIMER module_need() : 0.137 ms - Total 0.137 ms / 1 intvls (Avg 0.137 ms)
[0x8336c1c] main video output debug: no video output module matching "any" could be loaded
[0x8336c1c] main video output debug: TIMER module_need() : 0.587 ms - Total 0.587 ms / 1 intvls (Avg 0.587 ms)
[0x8336c1c] main video output error: video output creation failed
[0x8334e24] main spu text debug: removing module "freetype"
[0x833be04] main scale debug: removing module "yuvp"
[0x8335784] main scale debug: removing module "swscale"
[0x8320704] main decoder error: failed to create video output
[0x8320704] main decoder warning: can't get output picture
[0x831b0b4] main input debug: Stream buffering done (128 ms in 128 ms)
[0x831b0b4] main input debug: Decoder buffering done in 0 ms

Could someone help me with what I'm doing wrong? Any help is appreciated.

Sincerely,
Andy S.

[Jean-Baptiste Kempf]

Use the scene video filter.

[aespielberg]

Hi,

thanks for the quick reply. I tried doing the following:

cvlc --video-filter scene -V dummy --scene-format png --scene-width=1600 --scene-height=1200 --scene-prefix=pic --no-scene-replace v4l2:///dev/video0

But this doesn't make an images. All I need is to take one image from my device. What command should I do?

Thanks again for your help,
Andy

[aespielberg]

I made a little bit of progress. I now have:
vlc -I dummy v4l2:///dev/video0 --video-filter scene --no-audio --scene-path /home/user1 --scene-prefix test --scene-format jpg vlc://quit

This works, but it doesn't stop; it takes screens every 50 frames. How can I get it to take one screen and then quit?

[murple]

aespielberg: Hopefully you have figured this out by now, but in case you haven't I believe you need to add:

Code: Select all

--run-time=1

I found this thread while trying to solve my own problem, namely setting the exposure (V4L2) and similar settings manually, I can't figure it out although it's probably very simple. I found this:
http://wiki.videolan.org/Documentation: ... ideo_input

I figured this question was so simple that it didn't warrant a separate thread.